Abstract:

Rockfall threats to waterway safety in the form of directly hitting and impulsive in reservoirs. Three-dimensional fluid-solid mechanics coupling analysis is the hot spot in the present and represented future trendence in this research field. The authors take Jiandao Peak valley in Three Gorges Reservoir as the prototype, build a kε turbulence model coupling with GMO collision model with the help of Flow-3D software, assumed rockfall block amount to 1.2 × 10⁴m³. The result shows that the block bounces, rolls and slides on the slope. After it plunge into water, the water seriously effect its kinetic character, the moving object transfer a part of energy about 6.54% to water bodytransferring. Then the max impulsive wave height can reach 10 m, but it decays quickly, the wave height is 2.4 m in the middle of river and it is 0.89 m in the opposite bank. According to the wave height, the authors divide the riverway into several warning degree region, and suggest that the north waterway move 350 m southward, therefore the risk of waterway will reduce and the water safety will raise.

Key words: rockfall, impulsive wave, fluid-solid coupling, Jiandao Peak